Investors sue Facebook, Morgan Stanley

Investors have filed suit against Facebook CEO Mark Zuckerberg and underwriters of the IPO, including Morgan Stanley.

NEW YORK (CNNMoney) -- Three investors sued Facebook and chief executive Mark Zuckerberg on Wednesday, along with lead underwriter Morgan Stanley and a host of other underwriters, accusing them of withholding negative information about the social network's initial public offering.

"It appears as though material information was not disclosed," said Robert Weiser, one of the plaintiff lawyers in the class action suit. "We believe that the offering was conducted unfairly and it harmed public stockholders."

The suit was filed in the U.S. District Court for the Southern District of New York in Manhattan.

According to a report published by Reuters, Morgan Stanley (MS, Fortune 500) shared a negative assessment of the social network with major clients ahead of Facebook's (FB) IPO, which debuted last week.

The lawsuit states that "certain of the underwriter defendants" were given estimates for how Facebook would perform in the second quarter and for the full year.

The "revisions were material information which was not shared with all Facebook investors, but rather, was selectively disclosed by defendants to certain preferred investors and omitted from the registration statement and/or prospectus," the plaintiffs claim.

Facebook was one of the most anticipated -- but also disappointing -- IPOs in recent history. On Friday, the first full trading day, the stock closed at $38.23 per share, just a hair above its IPO price of $38.